SPANISH FORK, Utah, 22 July 2016 (AP) – A huge toxic algae bloom in Utah has closed one of the largest freshwater lakes west of the Mississippi River, sickening more than 100 people and leaving farmers scrambling for clean water during some of the hottest days of the year.

The bacteria commonly known as blue-green algae has spread rapidly to cover almost all of 150-square-mile Utah Lake, turning the water bright, anti-freeze green with a pea soup texture and leaving scummy foam along the shore.

"It smells like something is rotting," said Jason Garrett, water quality director for the Utah County Health Department. "We don't have an idea of how long this event will last."

Utah Lake doesn't provide drinking water, but its closure is causing big problems for people who use the lake for swimming, fishing and other activities and for farmers with thirsty crops.

Utah Poison Control says it has fielded hundreds of calls related to the bloom, including some 130 involving people who have reported vomiting, diarrhea, headache, and rashes.

The contamination has now spread to the Jordan River, which supplies irrigation to dozens of farmers around Salt Lake City, about 45 miles north of the lake. The problem has occurred amid days of triple-digit temperatures as growers prepare for farmers markets and try to nurture crops such as corn and fruit trees at key points in their development.

"We've spent hundreds of thousands of dollars on this crop, maxed out every dollar we have," said Luke Petersen, who farms about 100 acres of tomatoes, summer squash and other produce in Riverton. "We're real worried about it." […]

The lake is largely fed by treated wastewater as well as agricultural runoff, said Erica Gaddis, assistant director for the Utah Division of Water Quality.

Longstanding drought conditions have made the water especially low and stagnant. Combine that with hot summer weather and Utah Lake became a perfect petri dish for the cyanobacteria. [more]